Still from American Sniper. The comic is never named, but if you look closely, you can see that it's issue No. 1 of the sixth volume of Punisher, released in January of 2004 (making it very believable as something Biggles could be reading during the platoon's 2004 deployment).
A Dr. Garry Choy, MD, Diagnostic Radiology, answered. Radiation fibrosis is the result of prior radiation exposure that results in scarring of an organ such as breasts, lungs, etc. Post radiation treatment fibrosis is the typical cause.
A biopsy may be conducted of lung scar tissue in order for doctors to learn more about its nature and origins. Individuals with severe parenchymal scarring may require a lung transplant. Doctors use X-rays and other imaging technology to evaluate the extent of damage from scarring of lung tissue.f the parenchymal scarring is not benign, treatment can include steps to reduce further damage, such as changing a medication regimen for lung disease to bring inflammation down.